Micrometer caliper



Apr. 24, 1923.

| o. BEARD MICROMETER CALIPER Filed'June 24, 1922 Patented Apr. 24,1923.

tears MICROMETER GALIPER.

Application filed June 24, 1922. Serial No. 570,664.

T 0 all whom it may concern:

Be it known that I, LAWRENCE O. BEARD, a citizen of the United States ofAmerica, residing at No. 238 East Marion Street,'in the city ofLancaster, in the county ofLancaster and State of Pennsylvania, haveinvented certain new and useful Improvements in Micrometer Calipers, ofwhich the following is a specification.

My invention relates to micrometer-calipers, and has for its primary.object to pro vide a simply constructed and conveniently manipulatedinstrument for measuring the inside dimensions of internal combustionengine cylinders and the like.

Another obj eat of my invention is to provide an instrument of thischaracter which may be readily employed for height measurements.

Another object of myinvention is to provide a micrometer-caliper whichis self centering and self aligning.

A still further object of my invention is toprovide two sets of verticalgraduations' one on the stationary sleeve and the other on the rotatingspindle whereby the length adjustment of the spindle as represented byhorizontally disposed graduations on the spindle may be doubly checkedby the user.

Other and further objects and advantages of my invention will be in partdescribed and in part obvious as this specification is proceeded with.

In the accompanying drawings forming part of this specification:

Figure 1 is a side view of my invention;

Figure 2 is a side view of my invention partly in section showing thecentering plate in compressed position;

Figure 3 is an end View of my invention; and

Figure 4 is a side view of the spindle detached from the sleeve.

Referring more particularly to the draw ings 5 denotes what may betermed an inverted U-shaped base plate or alinement and centering plate,said plate formed with slightly curved or out turned sides or legs 6.This base 5 houses what may be termed a calipering or gauging block 7herein shown to be substantially V-shaped in cross section.

An internally-threaded sleeve 8 is fixedly mounted in an aperture 9formed in the block 7, and extends upwardly and slidingly through anaperture 10 in the base 5, said apertures being of similar size and ofnecessity aligned one with the other. A spring ring 11 seated in acorresponding groove 12 in the sleeve 8 slightly above the base plate 5prevents withdrawal of the sleeve but at the same time permits oflimited movement of the sleeve and the centering block 7 with respect tothe base plate. Springs 13 seated in recesses 14 in the centering blockand bearing at their upper ends against the underside of the base platecushion the move ment of'the block 7 toward the'base plate and tend tonormally maintain the block in projected or Figure 3 position.

A spindle 241 has a threaded portion 15 at one end which threadedlyengages the internal screw threads 16 of the sleeve. The other end ofthespindle projects from the sleeve and is provided with verticalgraduations 17 numbered in a clockwise direction 0,

5, 10, 15, 20, 25, 80, 35, 10 and 4:5 respectively,

respectively in a. clockwise direction.

When used for'measuring inside diameters, for instance the diameter ofan internal combustion engine cylinder the user inserts the tool in thecylinder (not shown) and after pressing the centering block into Figure2 position by forcing the same against the cylinder wall, proceeds tounscrew the spindle 14: until the latter touches the opposite wall ofthe cylinder. The set screw 20 is then screwed up to lock the spindleQagainst accidental turning movement in the sleeve 8, and the toolremoved for reading.

The distance from end to end of the tool, that is from tip of the.spindle to the bottom extremity of the point of the gage block 7, whenthe spindle is screwed down into the sleeve as far as it will go, andwhen the point of block 7 is flush with the'extremities of legs 6, wewill assume is three inches (3 in.). At this time the graduationsdesignated by 0 (or 50) respectively on the spindle will be in registerwith the vertical graduations designated by 0 (or 50) on the sleeve 8.If the spindle is now unscrewed say until the zero on the spindlecoincides with the vertical graduation designated by the numeral 5 onthe sleeve, the spindle will have been extended five one thousandths ofan inch, the intermediate graduations representing one thousandth of aninch. In order to check this reading the user of the tool glances at thezero on the sleeve and finds that this graduation registers with thevertical graduation designated by the numeral 5 on the spindle and isthus assured that his first reading was correct. The horizontallydisposed graduations 18 represent fifty one thousandths of an inch, andone complete rotation oft-he spindle in an anticlockwise directionextends the spindle one graduation or fifty one thousandths of an inch.

Having thus described my invention:

What I claim is:

1. A micrometer-caliper comprising an in verted U-shaped plate, acalipering hlock adapted to fit movably within said plate, a sleevemounted on said block and extending slidably through said plate, meansfor pre venting the withdrawal of said block and said sleeve from saidplate, means for cushioning the movement of said block towards saidplate, and a measuring spindle rotatably mounted for relativelongitudinal move ment in said sleeve, said sleeve and spindle havingcooperating graduations thereon.

2. A micrometer-caliper comprising a plate, a calipering blockassociated with said plate, a sleeve fixed to said block and projectingupwardly through said plate, a measuring spindle rotatably mounted forrelative longitudinal movement in said sleeve, said spindle havinghorizontally disposed graduations of fifty one thousandths of an inch,and said spindle and sleeve having vertically disposed graduations ofone thousandth of an inch numbered from zero to fifty and from fifty toZero respectively.

3. A micrometer-caliper comprising an apertured plate having legsthereon, a sleeve extending slidably through said aperture, a callperingblock fixed to the lower end of said sleeveand fitting between the legsof said plate, a spindle rotatably mounted for relative longitudinalmovement in said sleeve, said sleeve and spindle having cooperatingdistance measurement graduations thereon, means -for limiting themovement of said block away from said plate, and re silient means fornormally forcing said block away from said plate to the limit of itsmovement.

In testimony whereof I atlix my signature in presence of two witnesses.

LAWRENCE O. BEARD.

Witnesses:

CHAS. Gr. BAKER, GEO. Ross ESHLEMAN.

